/*******************************************************************************
* Copyright 2007-2013 See AUTHORS file.
 * 
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* 
*   http://www.apache.org/licenses/LICENSE-2.0
* 
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
package org.xmeta.util;

public class Semaphore {
	public synchronized void finished(){
        inuse = false;
        notify();
    }

    public synchronized void use() throws InterruptedException {
        if(inuse){
            try {
                wait();
            }
            catch(InterruptedException _ex){
            	throw _ex;                
            }
        }
        inuse = true;
    }

    public Semaphore(){
        inuse = false;
    }

    private boolean inuse;    
}